I'd recommend storing it AWS S3 with an encrypted key physically stamped onto metal cards (some crypto people use similar products for seed phrases). Distribut

I'd recommend storing it AWS S3 with an encrypted key physically stamped onto metal cards (some crypto people use similar products for seed phrases). Distribute the metal cards as widely as you can, at home, potentially in safety deposit boxes or buried somewhere (potentially with an additional layer of protection from a brain memory password.) This protects against a class of physical data destruction from house fires, theft, floods etc. However I'd withdraw this recommendation if you live in a jurisdiction where you can be compelled to hand over passwords, e.g England